#define _CRT_SECURE_NO_WARNINGS 1 
#include <iostream>
using namespace std;

class A 
{
public:

	A()
		:_a1(1),_a2(2)
	{
		cout << _a1 << _a2 << endl;
		this->_a1 = 3;
		this->_a2 = 4;
		cout << _a1 << _a2 << endl;

	}
	int _a1;
	int _a2;
};

int main()
{
	A a;
	cout << "_a1: " << a._a1 << " _a2: " << a._a2 << endl;

	return 0;
}